ia64/linux-2.6.18-xen.hg

view crypto/sha1.c @ 854:950b9eb27661

usbback: fix urb interval value for interrupt urbs.

Signed-off-by: Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Apr 06 13:51:20 2009 +0100 (2009-04-06)
parents 831230e53067
children
line source
1 /*
2 * Cryptographic API.
3 *
4 * SHA1 Secure Hash Algorithm.
5 *
6 * Derived from cryptoapi implementation, adapted for in-place
7 * scatterlist interface.
8 *
9 * Copyright (c) Alan Smithee.
10 * Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
11 * Copyright (c) Jean-Francois Dive <jef@linuxbe.org>
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
16 * any later version.
17 *
18 */
19 #include <linux/init.h>
20 #include <linux/module.h>
21 #include <linux/mm.h>
22 #include <linux/crypto.h>
23 #include <linux/cryptohash.h>
24 #include <linux/types.h>
25 #include <asm/scatterlist.h>
26 #include <asm/byteorder.h>
28 #define SHA1_DIGEST_SIZE 20
29 #define SHA1_HMAC_BLOCK_SIZE 64
31 struct sha1_ctx {
32 u64 count;
33 u32 state[5];
34 u8 buffer[64];
35 };
37 static void sha1_init(struct crypto_tfm *tfm)
38 {
39 struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
40 static const struct sha1_ctx initstate = {
41 0,
42 { 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0 },
43 { 0, }
44 };
46 *sctx = initstate;
47 }
49 static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
50 unsigned int len)
51 {
52 struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
53 unsigned int partial, done;
54 const u8 *src;
56 partial = sctx->count & 0x3f;
57 sctx->count += len;
58 done = 0;
59 src = data;
61 if ((partial + len) > 63) {
62 u32 temp[SHA_WORKSPACE_WORDS];
64 if (partial) {
65 done = -partial;
66 memcpy(sctx->buffer + partial, data, done + 64);
67 src = sctx->buffer;
68 }
70 do {
71 sha_transform(sctx->state, src, temp);
72 done += 64;
73 src = data + done;
74 } while (done + 63 < len);
76 memset(temp, 0, sizeof(temp));
77 partial = 0;
78 }
79 memcpy(sctx->buffer + partial, src, len - done);
80 }
83 /* Add padding and return the message digest. */
84 static void sha1_final(struct crypto_tfm *tfm, u8 *out)
85 {
86 struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
87 __be32 *dst = (__be32 *)out;
88 u32 i, index, padlen;
89 __be64 bits;
90 static const u8 padding[64] = { 0x80, };
92 bits = cpu_to_be64(sctx->count << 3);
94 /* Pad out to 56 mod 64 */
95 index = sctx->count & 0x3f;
96 padlen = (index < 56) ? (56 - index) : ((64+56) - index);
97 sha1_update(tfm, padding, padlen);
99 /* Append length */
100 sha1_update(tfm, (const u8 *)&bits, sizeof(bits));
102 /* Store state in digest */
103 for (i = 0; i < 5; i++)
104 dst[i] = cpu_to_be32(sctx->state[i]);
106 /* Wipe context */
107 memset(sctx, 0, sizeof *sctx);
108 }
110 static struct crypto_alg alg = {
111 .cra_name = "sha1",
112 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
113 .cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
114 .cra_ctxsize = sizeof(struct sha1_ctx),
115 .cra_module = THIS_MODULE,
116 .cra_alignmask = 3,
117 .cra_list = LIST_HEAD_INIT(alg.cra_list),
118 .cra_u = { .digest = {
119 .dia_digestsize = SHA1_DIGEST_SIZE,
120 .dia_init = sha1_init,
121 .dia_update = sha1_update,
122 .dia_final = sha1_final } }
123 };
125 static int __init init(void)
126 {
127 return crypto_register_alg(&alg);
128 }
130 static void __exit fini(void)
131 {
132 crypto_unregister_alg(&alg);
133 }
135 module_init(init);
136 module_exit(fini);
138 MODULE_LICENSE("GPL");
139 MODULE_DESCRIPTION("SHA1 Secure Hash Algorithm");